Method of treating iron ore for the recovery of chromium



stares rnnnnarc a. nusris, or MILTON,MASSACHUSETTS, Assien'oa or Tnnnn-ronnrns TO CHARLES PAGE'IIPERIN, OF NEW YORK, N. Y.

METI-FQQID OF TREATING IRON ORE FOR THE RECOVERY OF CHROIVIIUM.

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IT 0 Drawing.

T0 all whom it 172 (47 concern.

.-Be it known that I, Fnnnnnrc A. EUsTIs, a citizen oi the United States of America, and resident of Milton, in the county of Norfolk and State of Massachusetts, have invented new and useful Improvements in Methods of Treating Iron -Ore for the Recovery of Chromium, of which the following is a speci- A fication.

treatment of iron ores filed by me April 26,

1919, Serial No. 377,006.

The invention-is well adapted to the treatment of such ores as the soft iron ores of the north coast of the Island oi: Cuba, which occur as blanket deposits on top of the rocks forming that part of the island. The ores consist essentially of oxides and silicates of iron and aluminum, andcontain also small amounts of nickel, manganese and chromium together with much water. Such ores have the advantage for the present process that they do not have to be ground. But the process is also applicable to other fine ores, as well as said Cuban ores, whether they are fine in nature or are made fine by grinding. Such ores, as the Cuban ores can be treated lay'the present method without roasting. If,

7 however, the ore does not yield readily to the solvent it may be given a preliminary suitable roast to make the 1ron and other incidental metals aluminum, manganese and nickel, if present, readily soluble,-leaving the- Specification of Letters Patent. Patented Jam. 16), 1922,

Original. application filed April 26, 1919, Serial No. 377,006. Divided and this application filed June 12, 1920.

Serial No. 388,521.

also aluminum salts, and nickel and manganese if the latter metals were present in the ore and on the other hand a residue consisting of substantially all the silica and substantially all the chromium together with The residue, containing virtually all of the chromium approximately free from other metals, is admirably adapted for therecovery of chromiumwhich may be done by known methods.

I claim:

1. The method of treating an iron ore containing chromium, which comprises dissolving out the major part of the-iron leaving chromium as a residue.

2. The method of treating an iron ore containing chromium and other incidental metals, which comprises dissolving out the majorpart of the iron and other incidental metals leaving chromium as a residue.

53. The method of treating an iron ore containing chromium, which comprises dissolving out the major part of the iron leaving chromium and silica as a residue and there- I after recovering the chromium.

4; The method of treating an iron ore containing chromium and other incidental metals, which comprises dissolving out the ma or part of the iron and other incidental metals leaving chromium and silica as a residue and thereafter recovering the chromium.

The method of treating an iron ore containing chromium, whichcomprises dissolvme; out the mayor part of the iron with-a solution containing chlorides, leaving chromium as a residue.

6. The method of treating an iron ore contaming chromium, which comprises dissolving out the major part of the iron by means of a solvent which is also an electrolyte, leaving chromium as a residue.

Signed by me at Boston, Massachusetts, this ninth day of June, 1920.

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